A method is presented for improving the detection performance of the spacebased Synthetic Aperture Radar (SAR) system

in which the information is acquired by several SARs in a constellation observing the same area from different angles simultaneously

and then processed by the parallel distributed detection method.After studying the statistical characteristics of the ambiguity signal

with the impact of factors such as clutter

system noise and backscattering status considered

the individual spacebased SAR detection model is established

which shows that the detection performance depends on the observation angle.Based on the distributed detection theory

the Spacebased SAR Cooperation Detection (SSARCD) model is established

and the relationship between the detection performance and the parameters of the orbit

the platform and the SAR system is also determined

which benefits the design and realization of the cooperation detection system.Results from the contrast analysis prove that the detection performance of the SSARCD system is better than that of the individual spacebased SAR.